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Method for preparing efficient ecological restoration flora for Pb-polluted site by utilizing sludge

An ecological restoration and sludge technology, applied in the methods of using microorganisms and the restoration of polluted soil, can solve the problems of high energy consumption, long reaction period, secondary pollution, etc., and achieve economical improvement and shortened cultivation and domestication period. , the effect of strong natural tolerance

Pending Publication Date: 2016-09-21
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high temperature melting method is costly and consumes a lot of energy
The biological method has a long reaction cycle and is likely to cause secondary pollution by foreign biological agents
The effect of the curing method is unstable, and the curing agent is likely to cause secondary pollution to the soil
Patent No. 201510056406.6 introduces a solidification method for soil containing heavy metals, but this method uses a large amount of materials, and the cost is high. On the other hand, the solidification effect is unstable. For example, the added calcium oxide is prone to carbonation under natural conditions. Reduces the effect of alkaline curing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Mix the sludge with a solution containing a certain amount of carbon source, add a certain amount of sulfate, and put it into a reactor for biochemical reaction. Control the dry sludge content of the mixed solution to 0.5%, and the solid content to 10%, The organic carbon content is 12%, and the mass ratio of organic carbon / sulfate is 5:1, followed by reaction for 1 day;

[0016] (2) in the solution after step (1) reaction, add a certain amount of lead salt, control the mol ratio (2-3) of sulfate / lead: 1, the mass ratio (10-30) of organic carbon / lead: 1, followed by 5 days of reaction;

[0017] (3) Repeatedly add lead salt 2 times in the solution, every time control the mol ratio (2-3) of sulfate / lead: 1, the mass ratio of organic carbon / lead (10-30): 1, reaction time 5 days, and then obtain highly efficient ecological restoration flora.

Embodiment 2

[0019] (1) Mix the sludge with a solution containing a certain amount of carbon source, add a certain amount of sulfate, put it into the reactor for biochemical reaction, control the dry sludge content of the mixed solution to 8-10%, and the solid content to 10- 15%,, the organic carbon content is 10-15%, the mass ratio of organic carbon / sulfate is 20:1, and then reacted for 0.1-1 day;

[0020] (2) in the solution after step (1) reaction, add a certain amount of lead salt, control the mol ratio (1-5) of sulfate / lead: 1, the mass ratio (30-80) of organic carbon / lead: 1, followed by 0-1 days of reaction;

[0021] (3) repeatedly add lead salt 1 time in the solution, control the mol ratio (1-5) of sulfate / lead: 1, the mass ratio (30-80) of organic carbon / lead: 1, reaction time 1 day, then Obtain efficient ecological restoration flora.

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Abstract

The invention provides a method for preparing an efficient ecological restoration flora for a Pb-polluted site by utilizing sludge. According to the method, by adding a carbon source and sulfate into the sludge, a sulfate reducing flora in the sludge rapidly grows, and sulfides are generated at the same time; then, lead salt is added into the sludge, and the sulfides capable of inhibiting the growth of the sulfate reducing bacteria are consumed; due to the existence of the sulfides, the toxicity of the lead salt to the sulfate reducing bacteria is greatly reduced, and the Pb resistance of the cultured sulfate reducing flora is also improved.

Description

technical field [0001] The invention provides a method for preparing highly efficient ecological restoration flora of Pb-contaminated sites by using sludge, by adding carbon source and sulfate to the sludge, so that the sulfate-reducing flora in the sludge grows rapidly and produces sulfide at the same time; Adding lead salt consumes sulfide that inhibits the growth of sulfate-reducing bacteria, and the presence of sulfide also greatly reduces the toxicity of lead salt to sulfate-reducing bacteria, and at the same time improves the Pb resistance of the cultured sulfate-reducing bacteria. field of environmental protection. Background technique [0002] Due to the random discharge of mining and metallurgical wastewater, a large amount of soil has been polluted by Pb. Current methods of dealing with lead-containing soils are flawed. The high temperature melting method is costly and consumes a lot of energy. The biological method has a long reaction cycle and is likely to cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/36B09C1/10
CPCC12N1/36B09C1/10
Inventor 张大磊李瑞栋王欣玉
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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